2013 Mustang GT Turn Signals

What exactly do you mean by not fitting??? 7440 and 7443 are identical sockets. The only difference is that 7440 has only 2 wires (being single-filament) and 7443 has 4 (dual filament). There is absolutely NO distinction between the actual plastic socket.

I'm not sure what to tell you other than both that I've tried do not fit. They pop right out like the length of the bulb's plastic housing is too long or something. It never snaps into place like the oem amber turn signals do.

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